the dirs are numbered so they maintain the order that they were on the webside
which is apparently from the oldest date to the newst date, so 1 is older, 4
is newer (eg. driver)

ok they are not always ordered by date at all!
example:
http://support.lenovo.com/hu/en/products/laptops-and-netbooks/thinkpad-t-series-laptops/thinkpad-t400?c=1&beta=true


